CVE-2026-40479: Kimai is an open-source time tracking application

Q: How do I fix CVE-2026-40479?

kimai: upgrade to 2.53.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-40479 being exploited?

CVE-2026-40479 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-40479 affect?

CVE-2026-40479 affects kimai. Severity is medium (CVSS 5.4). Kimai is an open-source time tracking application. In versions 1.16.3 through 2.52.0, the escapeForHtml() function in KimaiEscape.js does not escape double quote or single quote characters. When a user's profile alias is inserted into an HT

Q: How urgent is CVE-2026-40479?

Priority 27/100. Public exploit reference

Routine

MEDIUM 5.4UPGRADE

CVE-2026-40479 is a medium-severity flaw (CVSS 5.4) affecting kimai. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Kimai is an open-source time tracking application. In versions 1.16.3 through 2.52.0, the escapeForHtml() function in KimaiEscape.js does not escape double quote or single quote characters. When a user's profile alias is inserted into an HTML attribute context via the team member form prototype and rendered through innerHTML, this incomplete escaping allows HTML attribute injection. An authenticated user with ROLE_USER privileges can store a mali

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-04-17
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: kimai

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-17 23:16 UTCPublished CVE record published
2026-06-17 10:45 UTCUpdated Record last modified

kimai kimai UPGRADE

Affected: < 2.53.0

Fixed in: 2.53.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy kimai || rpm -q kimai || kimai --version

2. UPGRADE to 2.53.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade kimai

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade kimai

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40479?

kimai: upgrade to 2.53.0. Exact commands for each OS are on this page.

Is CVE-2026-40479 being exploited?

CVE-2026-40479 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40479 affect?

CVE-2026-40479 affects kimai. Severity is medium (CVSS 5.4). Kimai is an open-source time tracking application. In versions 1.16.3 through 2.52.0, the escapeForHtml() function in KimaiEscape.js does not escape double quote or single quote characters. When a user's profile alias is inserted into an HT

How urgent is CVE-2026-40479?

Priority 27/100. Public exploit reference

Related CVEs

CVE-2026-44298 MEDIUM 4.1 UPGRADE Kimai is an open-source time tracking application
CVE-2026-42267 MEDIUM 5.7 UPGRADE Kimai is an open-source time tracking application
CVE-2026-41498 LOW 3.3 UPGRADE Kimai is an open-source time tracking application
CVE-2026-40486 MEDIUM 4.3 UPGRADE Kimai is an open-source time tracking application
CVE-2026-28685 MEDIUM 6.5 UPGRADE Kimai is a web-based multi-user time-tracking application

References

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